A group of students studied how water can weather rocks. They soaked a small sample of sandstone in water. Then, they froze
the sample overnight. They warmed and resoaked the sample the next day. They continued this process each day for three
months.
Water
26 °C/
80 °F
Rock sample
0 °C/
32 °F
Rock sample
Water
Repeat for 3 months
What change to the rock sample would students observe at the end of the experiment?
O A. The rock dissolved because it repeatedly melted and
evaporated.
O B. The rock gained mass because new rock formed around
the edge.
26 °C /
80 °F
Rock sample
OC. The rock broke into smaller pieces because cracks formed
in the rock.
O D. The rock became a different rock type because its
chemical structure changed.

Answer:

5.702 mol K₂SO₄

General Formulas and Concepts:

Atomic Structure

Stoichiometry

Explanation:

Step 1: Define

[Given] 993.6 g K₂SO₄

[Solve] moles K₂SO₄

Step 2: Identify Conversions

[PT] Molar Mass of K: 39.10 g/mol

[PT] Molar Mass of S: 32.07 g/mol

[PT] Molar mass of O: 16.00 g/mol

Molar Mass of K₂SO₄: 2(39.10) + 32.07 + 4(16.00) = 174.27 g/mol

Step 3: Convert

Step 4: Check

Follow sig fig rules and round. We are given 4 sig figs.

5.7015 mol K₂SO₄ ≈ 5.702 mol K₂SO₄

To determine which balloon has the greater number of particles between A (O2) and B (Ne), we can use the given mass and the molar masses of the gases to find the number of moles, which is proportional to the number of particles.

Step 1: Find the molar mass of O2 and Ne.
- O2 has a molar mass of 32.0 g/mol (since the atomic mass of O is 16.0 g/mol and O2 has two oxygen atoms).
- Ne has a molar mass of 20.18 g/mol.

Step 2: Calculate the number of moles for each gas using the given mass of 10.0 grams.
- For O2: moles = (10.0 grams) / (32.0 g/mol) = 0.3125 mol
- For Ne: moles = (10.0 grams) / (20.18 g/mol) = 0.4955 mol

Step 3: Compare the number of moles to determine which balloon has more particles.
- Since 0.4955 mol (Ne) > 0.3125 mol (O2), the balloon filled with Ne (B) has a greater number of particles.

So, in the pair of balloons filled with 10.0 grams of O2 (A) and Ne (B), the balloon with the greater number of particles is B (Ne).

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To determine the lowest amount of ions or molecules dissolved in water, we need to calculate the moles of solute in each solution. Moles = volume (L) × molarity (M).

1] 1.5 L × 225 M C12H22O11 = 337.5 moles
2] 0.250 L × 1.25 M K3PO4 = 0.3125 moles
3] 2.0 L × 1.5 M K2SO4 = 3 moles
4] 0.250 L × 0.5 M HBr = 0.125 moles
5] 0.750 L × 0.75 M HBr = 0.5625 moles

Your answer: The aqueous solution containing the lowest amount of ions or molecules dissolved in water is option 4, 250 mL of 0.5 M HBr.

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Answer:

I think the answer is true

The boiling requires overcoming air pressure with vapor pressure, the boiling temperature of water depends on your height from sea level. Additionally, although this tends to raise the boiling point, it relies on the presence of contaminants in the water.

However, water boils at sea level at a temperature of 100 degrees Celsius. It serves as a definition. Because that is what the Celsius system is founded on, that temperature was picked. Actually, the temperature that pure liquid water at sea level cannot get above is 100 degrees Celsius, which is the most that it can be heated to before plateauing. The "boiling point" measures the actual object in question.

If you gauge the temperature from the first sign of boiling, it may occur at a little lower levels. Whisps of vapor may be seen around 90–95 degrees, but if you are at sea level with a reliable thermometer and clear water, the temperature should increase to 100 and remain there until the water starts to boil.

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Ionic bonds are created when two oppositely charged ions are attracted to one another by electrostatic force. A chemical element is uniquely defined by its atoms, which are tiny pieces of substance.

An atom is made up of a core nucleus and one or more negatively charged electrons that orbit it. The positively charged, comparatively hefty protons and neutrons that make up the nucleus may be present. Any elementary particle of matter with at least one proton is referred to as an atom. Examples of atoms are neon (N) and hydrogen (H) (Ne). Chemistry's fundamental building component is an atom. It is the lowest fraction of substance into which electrically charged particles cannot be released. It is also the smallest piece of substance with chemical element-like characteristics.

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Answer

0.1

Explanation

Given:

mass of HCl = 0.915g

volume of HCl = 250 mL

We know the molar mass of HCl = 36,458 g/mol

Solution

Step 1: covert the volume from mL to L

1 mL = 0.001 L

therefore 250 mL = 0.25 L

Step 2: Calculate the number of moles of HCl

n = m/M where n is the moles, m is the mass and M is the molar mass

n = 0.915 g/36,458 g/mol

n = 0.025 mol

Step 3: Calculate the molarity

C = n/V where C is the molarity, n is the moles and V is the volume

C = 0.025 mol/0.25 L

C = 0.1

Answer:

because of static energy that's why and gravity

Answer:

Solution: 3.78 L He. 22.4 L. 1 mol. = 0.169 mol He.

Explanation:

Answer:

3.78 liters

Explanation:

If a balloon is filled with 3.78 L of He gas is at STP.

6moles of ammonia are produced when 3 miles of nitrogen react with hydrogen in the reaction N\(_2\)+3H\(_2\)→2NH\(_3\).

A mole is just a measuring scale. In reality, it's one of the International System of Units' seven foundation units (SI). When already-existing units are insufficient, new ones are created.

The levels at which chemical reactions frequently occur exclude the use of grams, yet utilizing actual numbers of atoms, molecules, or ions would also be unclear. To fill this gap between extremely small and extremely huge numbers, scientists created the mole.

N\(_2\)+3H\(_2\)→2NH\(_3\)

moles of nitrogen =  3 moles

moles of ammonia= 3×2moles =6moles

Therefore, 6moles of ammonia are produced when 3 miles of nitrogen react with hydrogen.

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Answer: Diffusion is the movement of particles from a high to low particle concentration, while osmosis is the movement of water from a high to a low water concentration.

Explanation:

Answer: the answer is B: Minerals dissolve and crystallize! :D

Explanation: hope this helps!

The opposite of the words given include the following below:

a. boiling - cooling

b. melting - freezing.

This is referred to as a physical process which involves the conversion of a solid to a liquid such as from ice to liquid water.

The opposite of this is freezing which involves solidification and can be described as the conversion of a liquid to solid.

Boiling on the other hand involves the application of heat to a substance while the opposite will be reduction of heat which is referred to as cooling thereby making them the correct choices.

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Answer:

1.54 atm

Explanation:

By Dalton's Law Of partial pressure,

Total Pressure = Sum of all partial pressures

So,P= P1 + P2 + P3

Therefore, P=0.23+0.42+0.89

=1.54 atm

Small impure crystals will form if the filtrate solution is cooled too rapidly.

The solution is a homogeneous aggregate of one or extra solutes dissolved in a solvent. Solvent: the substance in which a solute dissolves to supply a homogeneous combination. Solute: the substance that dissolves in a solvent to produce a homogeneous combination.

Solutions are uniform combinations of molecules wherein any of the levels of remembering can be dissolved in any other segment.

Household cleaners like bleach are solutions, they help us to make our houses smooth. Beverages such as fizzy drinks, mineral water, and tea are some of the answers.

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The compound that will not pass through filter paper when stirred in water is (1) Hg₂Cl₂. This is because Hg₂Cl₂ is insoluble in water and forms precipitate when stirred in water. This precipitate will not pass through filter paper and can be separated from solution.

Compound is a substance that is made up of two or more different elements that are chemically bonded together in a fixed proportions. The elements in a compound cannot be separated by physical means, but can only be separated by chemical reactions. Compounds have their own unique chemical and physical properties that are different from the elements that make them up.

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β-carbonyl carboxylic acids are carboxylic acids that contain a carbonyl group (C=O) attached to the β-carbon atom, which is the carbon atom adjacent to the carboxyl group (-COOH).

Other carboxylic acid derivatives include esters, amides, and anhydrides. Esters are formed by the reaction of a carboxylic acid with an alcohol, while amides are formed by the reaction of a carboxylic acid with an amine. Anhydrides are formed by the dehydration reaction of two carboxylic acid molecules.

To classify a compound as a β-carbonyl carboxylic acid or another carboxylic acid derivative, you would need to examine its chemical structure and identify the presence of a β-carbonyl group or other functional groups characteristic of esters, amides, or anhydrides.

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When an element reacts with oxygen, the resulting compound's chemical formula is determined by the number of oxygen atoms that the element can bond with. This reaction produces a compound known as an oxide.

It is a compound that contains one or more oxygen atoms bonded to one or more other elements. The chemical formula of the resulting compound is determined by the number of oxygen atoms that the element can bond with.

To illustrate, let's look at the reaction between oxygen and the element sodium:2 Na(s) + O2(g) → 2 Na2O(s)

The chemical formula of the resulting compound is Na2O.

Here, sodium (Na) is an element, and oxygen (O) is also an element. The chemical formula of sodium oxide is Na2O.

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Answer:

when there is more kinetic energy the objects moves fast...

Answer:

NON METAL

Explanation:

come on really

26.7% is the percent composition by mass of sulfur in a compound named magnesium sulfate. Explanation: Molar mass of compound = 120 g/mol.

In kinematics, a scalar variable known as the speed of an object is frequently used to express how much its position varies over time or how much it changes per unit of time.

In Newtonian physics, an object's linear momentum, translational momentum, or simply momentum is defined as the product of its mass and velocity. It is a vector quantity since it has both a magnitude and a direction. The formula mathbfp = m mathbfv determines an object's momentum p if it has mass m and velocity v.

The vehicle will travel 300 cm farther while traveling at a high speed than when moving more slowly.

The truck's speed will be reduced by the weight of the 50g of earth it contains since speed is calculated as distance * time. increasing the amount of time needed to travel a distance.

When the truck is empty, however, it will take less time to travel that distance since the weightlessness will increase its speed.

The weight of an object refers to the gravitational force acting on it. Weight is the term used in many widely used textbooks to describe the gravitational force exerted on the object. Weight is sometimes referred to as a scalar quantity that gauges the strength of the gravitational pull.

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concentration of the acetone immediately after mixing

We are given:

- Molarity of Acetone\($=4.0 \mathrm{M}$,\)

- Volume of Acetone\($=11 \mathrm{~mL}=0.011 \mathrm{~L}$,\)

- Volume of\($B r_2=16 \mathrm{~mL}$,\)

- Volume of \($\mathrm{HCl}=11 \mathrm{~mL}$\), and

- Volume of Water\($=16 \mathrm{~mL}$.\)

therefore Total Volume of Solution\($=(11+16+11+16) m L=54 m L=0.054 L$\)and

Total No. of moles \(\mathrm{M} \times 0.011 \mathrm{~L}$$=0.044 \mathrm{~mol}$\)of Acetone = Molarity of Acetone \($\times$\) Volume of Acetone i =4.0

\($\therefore$ Molarity of Acetone $=\frac{\text { No. of moles of Acetone }}{\text { Volume of solution in liter }}$\)

\($=\frac{0.044 \mathrm{~mol}}{0.054 \mathrm{~L}}$$=0.815 M$Hence, Concentration of Acetone (in Molarity) is $0.815 \mathrm{M}$.\)

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The statement "an atom contains all the other levels of biological organization" is false.

It is known that, all those other biological organization tiers are present in the biosphere. None of the three are living, unlike a nucleus, despite being underneath the cell's surface.

Organelles, cells, tissues, organs, organ systems, organisms, populations, communities, ecosystems, and biosphere have become the biological stages of the structure of living things, listed from the lowest to the most complex.

There are 13 organizational levels. Atoms, molecules, organelles, cells, tissues, organs, organ systems, creatures, populations, communities, ecosystems, biomes, and biosphere are still the sequential representations of these elements. Atom: The simplest and also most fundamental building block of matter.

Cells are the smallest unit of organization for just a living entity. Since cells are the tiniest units of life, they are where all of an organism's biochemical activity takes place that's why given statement will be false.

Therefore, the atom contains all the other levels of biological organization. is false statement.

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Answer:

Explanation:

According to legend, Galileo dropped weights off of the Leaning Tower of Pisa, showing that gravity causes objects of different masses to fall with the same acceleration. In recent years, researchers have taken to replicating this test in a way that the Italian scientist probably never envisioned — by dropping atoms. One of Galileo's contributions to the founding of modern science was his study of falling objects.  He turned, then, to measuring the acceleration of objects rolling down smooth ramps. The ramp "diluted" the acceleration to a value small enough to allow accurate measurements of the longer time intervals.

Answer:

False

Explanation:

To go from 10 g of water ice at 273 K to water vapor at 373 K, it would require approximately 7.5155 kJ of energy.

To calculate the energy required for the phase change from ice to water vapor, we need to consider the heat involved in each step.

First, we calculate the energy required to heat the ice from 273 K to its melting point at 273 K. This is given by the equation:

Energy = mass × specific heat capacity × change in temperature

The specific heat capacity of ice is approximately 2.09 J/(g·K), so the energy required is:

Energy1 = 10 g × 2.09 J/(g·K) × (273 K - 273 K) = 0 J

Next, we calculate the energy required to melt the ice at its melting point. The heat of fusion of ice is 333.55 J/g. Therefore, the energy required is:

Energy2 = 10 g × 333.55 J/g = 3335.5 J

Finally, we calculate the energy required to heat the liquid water from 273 K to 373 K. The specific heat capacity of water is approximately 4.18 J/(g·K). Thus, the energy required is:

Energy3 = 10 g × 4.18 J/(g·K) × (373 K - 273 K) = 4180 J

Summing up the energies:

Total energy = Energy1 + Energy2 + Energy3 = 0 J + 3335.5 J + 4180 J = 7515.5 J

Converting to kilojoules:

Total energy = 7515.5 J / 1000 = 7.5155 kJ

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Answer:

Radio station A broadcasts a signal with a frequency of 98.7 MHz, and radio station B broadcasts a signal with a frequency of 100.3 MHz. What can be said about ...

Explanation:

Among electromagnetic waves, UV rays are most dangerous because exposure to these radiation cause serious problems in living organism. Therefore, radio station B will have more energy than radio station A.

Electromagnetic wave is a wave which contain two component one is electric component and other is magnetic component. The electric and magnetic component are perpendicular to each other. There are so many wave that comes under electromagnetic wave like infrared wave , radio wave.

There is a relation between energy of wave, frequency of wave, and

Mathematically,

E=hν

where,

E = energy of electromagnetic wave

ν= frequency of wave

From above formula we can see that energy is directly proportional to frequency of the wave. Since radio station B broadcasts a signal with a frequency of 100.3 MHz.  Radio station B will have more energy than radio station A.

Therefore, radio station B will have more energy than radio station A.

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The percent mass composition of carbon of the unknown compound is 42.8%.

The mass percentage of carbon in the given unknown compound is calculated as follows:

molar mass of carbon dioxide = 44.0 g/mol

molar mass of carbon = 12 g/mol

molar mass of water = 18 g/mol

molar mass of hydrogen = 1.0 g/mol

Moles of carbon dioxide = 2.31/44

Moles of carbon dioxide = 0.0525 moles

Moles of Carbon = 0.0525 moles

mass of carbon = 0.0525 * 12

mass of carbon = 0.105 g

Moles of water = 1.26/18

Moles of water = 0.07 moles

Moles of hydrogen = 0.07 * 2

Moles of hydrogen = 0.14 moles

mass of hydrogen = 0.14 * 1

mass of hydrogen = 0.14

mass of compound = 0.105 + 0.14

mass of compound = 0.245

Percentage mass of carbon = 0.105/0.245 * 100

Percentage mass of carbon = 42.8%

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